15140

Edited by the Staff of National College of Education , Evanston, Ill.

Chicago Childrens Press

[c1962]

20v.: ill.(part col) Ports. Col. maps

Vols . 1-19, Continuously paged. v. 20: Parents and teachers guide. Index, and bibliography(p.77-91)

AU Science- ctionaries , AU Title: Science encyclopedia

503

Y68

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